EP0043991B1 - Verfahren zum Einbrennen von lichtempfindlichen Schichten bei der Herstellung von Druckformen - Google Patents

Verfahren zum Einbrennen von lichtempfindlichen Schichten bei der Herstellung von Druckformen Download PDF

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Publication number
EP0043991B1
EP0043991B1 EP81105123A EP81105123A EP0043991B1 EP 0043991 B1 EP0043991 B1 EP 0043991B1 EP 81105123 A EP81105123 A EP 81105123A EP 81105123 A EP81105123 A EP 81105123A EP 0043991 B1 EP0043991 B1 EP 0043991B1
Authority
EP
European Patent Office
Prior art keywords
printing
aqueous solution
weight
acetic acid
acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81105123A
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German (de)
English (en)
French (fr)
Other versions
EP0043991A2 (de
EP0043991A3 (en
Inventor
John E. Walls
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CNA Holdings LLC
Original Assignee
American Hoechst Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Hoechst Corp filed Critical American Hoechst Corp
Publication of EP0043991A2 publication Critical patent/EP0043991A2/de
Publication of EP0043991A3 publication Critical patent/EP0043991A3/de
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Publication of EP0043991B1 publication Critical patent/EP0043991B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/40—Treatment after imagewise removal, e.g. baking

Definitions

  • the present invention relates to a method for baking exposed and developed light-sensitive layers during the production of offset printing forms.
  • Positive-working photosensitive offset printing plates are usually produced by providing a support made of metal, such as aluminum or based on organic polymers, with a photosensitive layer which contains, as a photosensitive compound, an o-naphthoquinonediazide, either alone or with appropriate additives such as binders and / or dyes can be combined. After exposure of this photosensitive printing plate through a transparent positive, the photosensitive compound decomposes at the exposed areas and the photosensitive layer becomes relatively more soluble at these locations; for development, these areas can therefore be easily removed with an aqueous alkaline solution, a positive image of the template being formed on the support (printing form production).
  • a support is used, the surface of which is hydrophilic or has previously been hydrophilized by a special treatment, in which case during the development of the exposed light-sensitive layer parts of the hydrophilic support surface are exposed which are later water-accepting and ink-repellent (non-image areas). On the other hand, the remaining image areas are oleophilic and therefore accepting color.
  • Negative offset printing plates often contain azido compounds, diazonium salts or photopolymerizable compounds as photosensitive compounds. With these printing plates, the unexposed areas are removed with developer, the hydrophilic, water-accepting and ink-repellent surface of the printing plate carrier being exposed. In contrast, the areas that are hardened by exposure and remain as image areas after development are oleophilic and ink-accepting.
  • the level of the heating temperature and the duration of the heating are chosen so that the decomposition of the ink-carrying (not hit by the light) image precipitates on the parts of the printing plate which are water-carrying during printing (removed by the developer and hit by the light); an aftertreatment then cleans these water-carrying parts of the printing plate again when printing.
  • the heating temperature should in particular be 200 ° to 250 ° C, the associated heating time is then 5 to 60 min; the heating is carried out in a baking oven.
  • a typical, undesirable side effect of the stoving process is that the properties of the surface of, for example, aluminum supports can change from hydrophilic to oleophilic. Aluminum oxides present at the interface are likely to undergo complex rearrangements, catalyzed by high ambient temperatures, which lead to a shift in the hydrophilic / hydrophobic balance.
  • special printing inks are used in later printing, which can also contain components that dissolve or at least dissolve or swell the image areas on the printing form (e.g. UV-curable ink, a color that can be hardened at low temperatures, etc.), the image areas of printing inks produced in a conventional manner are greatly changed by these inks, which - compared to cases where an ordinary printing ink is used - for example considerably reduce the service life of these plates.
  • special inks by baking the printing forms, a sufficient number of copies can be made using the above-mentioned special inks, since the resistance of the image areas to, for example, organic solvents (as a color component) is markedly improved.
  • the hydrophilic non-image areas of the printing form ie. H. the areas where the hydrophilic surface of the support has been exposed by development lose their hydrophilicity and tend to take on color, which results in contamination when printing from these printing forms on the background areas of the prints.
  • numerous process steps for the overall process flow have been proposed by numerous manufacturers. Post-treatment steps such as redevelopment, cleaning of the plates or chemical post-treatment of the plates have been proposed for this.
  • procedural steps are recommended before the stoving stage is used in order to avoid a reduction in the hydrophilic surface properties of the carrier material.
  • the compounds which can be used before or during baking to modify the surface of the plate are often subject to chemical changes even at the elevated temperatures to be used, which change their intended effect, i. H. can destroy their hydrophilizing effect due to their chemical structure; A reduction in the oleophilicity of the image areas was also observed.
  • the post-bake cleaning is often carried out with very aggressive chemicals such as fluorides, which, in addition to their toxicity, can also attack the oxide layer of aluminum substrates, for example.
  • This treatment stage is intended to prevent the non-image areas from being excessively hydrophobized during the baking process, so that a post-bake treatment would be necessary due to this negative influence.
  • the invention is based on the known method for baking exposed and developed light-sensitive layers during the production of offset printing forms with an additional modifying treatment of the surface of the printing form having the image and non-image areas with at least one water-soluble organic amino compound between the development and the baking stage.
  • the process according to the invention is then characterized in that an aqueous solution which contains at least one amine containing carboxyl groups or one of its salts is used for the modifying treatment.
  • the method according to the invention can in principle be used for any offset printing plate which contains one of the usual light-sensitive compounds such as diazo, diazonium or azido compounds or photopolymerizable compounds in the positive or negative working layer (see, for example, Jaromir Kosar, "Light-Sensitive Systems” , John Wiley & Sons, New York, 1965); but especially for those printing plates which contain at least one diazo compound as a light-sensitive component in the positive-working photosensitive layer, in particular these compounds are esters or amides of o-naphthoquinonediazide sulfonic acids or o-naphthoquinonediazide carboxylic acids (see, for example, DE-B-1 447 963 already mentioned at the beginning ).
  • the light-sensitive layers normally also contain a resin, in particular a novolak and / or a resol, but various other components such as dyes or adhesion promoters can also be present.
  • Support materials for the light-sensitive layers can be used in offset printing technology customary used, include, in addition to the less suitable for baking processes because of their generally insufficient temperature-stable composition of organic polymers such as polyesters, especially metal foils based on aluminum, zinc or steel; aluminum plates are preferably used which are chemically, mechanically or electrochemically roughened and optionally also carry an aluminum oxide layer.
  • the printing plate support material is also modified on the surface before the photosensitive layer is applied, for example with aqueous polyvinylphosphonic acid or sodium silicate solutions.
  • the printing plates provided by the manufacturer or consumer with the photosensitive layer are exposed and developed using a method known from the prior art. This can include, for example, exposure to UV rays through a photomask and development with an aqueous alkaline developer.
  • the developed printing plate is now coated with an aqueous solution of one or more carboxyl group-containing amine (s) or salts thereof and then subjected to a baking treatment. It can be assumed that the heat cross-links the resins of the image areas that remain on the plate after development, thereby strengthening the image.
  • the amine protects the hydrophilic non-image areas during baking and prevents them from becoming oleophilic; this protective function may be due to the fact that a surface film is formed on the carrier material (e.g. aluminum or aluminum oxide). After baking, chemical post-treatment of the printing form is no longer necessary.
  • the good protective function for the hydrophiles of the non-image areas is accompanied by a permanent oleophilicity of the image areas.
  • Such amines containing carboxyl groups can either be present as such (e.g. ethylenediamine-tetraacetic acid) or individual carboxyl groups can be substituted by aliphatic compounds having 2 to 8 carbon atoms (e.g. hydroxyethylethylenediamine-triacetic acid).
  • the amines to be used according to the invention can be mixed with acids such as sulfuric, nitric, phosphoric, acetic, citric or tartaric acid.
  • acids such as sulfuric, nitric, phosphoric, acetic, citric or tartaric acid.
  • the cation is withdrawn from the carboxylates by the added acid and replaced by a proton of the acid, the corresponding aminocarboxylic acids being formed. The released cation can then react with the added acid to form a complex salt. Is z. B.
  • the solution used according to the invention would accordingly consist of a mixture of an aminocarboxylic acid and monosodium phosphate.
  • the aqueous solution to be used in the process according to the invention generally has a concentration of non-aqueous components between 0.1 and 40% by weight, preferably between 0.1 and 15% by weight, and particularly preferably between 0.1 and 7% by weight. -% on.
  • the pH of the mixture is usually between 2.5 and 9.0.
  • the aqueous solution is simply applied to the image side of the printing plate at room temperature and left to dry.
  • Different coating temperatures, drying temperatures or drying times have no noticeable disadvantageous effect on the successful practical application of the method.
  • Particularly good results are achieved if the modifying pretreatment step is carried out in such a way that the applied aqueous solution, after drying, leads to a layer weighing 10 g / m 2 or more;
  • the smallest amount necessary to achieve satisfactory results will probably be used to save material costs.
  • This minimum amount can be determined by a person skilled in the art without difficulty; it is a minimum of 10 mg / 2 , in particular 45 mg / m2.
  • the printing plate is rubbed with a sponge or cotton tampon soaked with the aqueous solution; however, the printing plate can also be immersed in a bowl filled with the aqueous solution or another method of this type can be used. Smoothing the coating from the aqueous solution, e.g. B. with the help of a rubber squeegee, ensures particularly good results.
  • the printing plate treated in this way is then baked in an oven at a temperature of about 120.degree. C. to 270.degree. C. for up to 45 minutes, more usual baking times being 2 to 10 minutes.
  • Burning is usually done in an oven specially designed for printing plates, e.g. B. a ®Encoven available from Azoplate, a company of the American Hoechst Corporation (Somerville-USA).
  • parts by weight to parts by volume are like g to cm 3 , the percentages are in% by weight.
  • the printing plate thus prepared was exposed in a conventional manner, using a developer composed of 16.2 parts by weight of n-propanol, 5.6 parts by weight of MgSO 4 , 0.7 parts by weight of isooctylphenol polyglycol ether with 4 ethylene oxide units and 77 , 5 parts by weight of H 2 0 developed and divided into two samples.
  • Sample 1 was placed in a printing press and 70,000 good prints were obtained until the image collapsed; previously there were sound problems.
  • Sample 2 was coated with a 7% strength aqueous solution of the sodium salt of ethylenediamine tetraacetic acid, dried and baked at 150 ° C. for 5 minutes. After cooling, the plate delivered 200,000 good prints in a printing press without sound problems until the picture collapsed. No treatment was required to remove the protective film after baking. The image areas of the copies were completely colored and the background areas were neither toned nor stained.
  • the coated plate was then baked in an oven at 140 ° C. for 7 minutes and placed in a printing press. 400,000 satisfactory copies were obtained until the picture collapsed; there were no sound problems.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP81105123A 1980-07-11 1981-07-02 Verfahren zum Einbrennen von lichtempfindlichen Schichten bei der Herstellung von Druckformen Expired EP0043991B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/167,615 US4355096A (en) 1980-07-11 1980-07-11 Process for heating exposed and developed light-sensitive lithographic printing plates with carboxylic acid and amine moiety containing compounds on surface thereof
US167615 1980-07-11

Publications (3)

Publication Number Publication Date
EP0043991A2 EP0043991A2 (de) 1982-01-20
EP0043991A3 EP0043991A3 (en) 1982-05-26
EP0043991B1 true EP0043991B1 (de) 1985-01-23

Family

ID=22608076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105123A Expired EP0043991B1 (de) 1980-07-11 1981-07-02 Verfahren zum Einbrennen von lichtempfindlichen Schichten bei der Herstellung von Druckformen

Country Status (5)

Country Link
US (1) US4355096A (enrdf_load_stackoverflow)
EP (1) EP0043991B1 (enrdf_load_stackoverflow)
JP (1) JPS5752057A (enrdf_load_stackoverflow)
CA (1) CA1164723A (enrdf_load_stackoverflow)
DE (1) DE3168463D1 (enrdf_load_stackoverflow)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138551A (ja) * 1983-12-26 1985-07-23 Fuji Photo Film Co Ltd 製版方法
EP0149490B2 (en) * 1984-01-17 1993-12-15 Fuji Photo Film Co., Ltd. Presensitized plate having an anodized aluminum base with an improved hydrophilic layer
DE3410522A1 (de) * 1984-03-22 1985-10-03 Hoechst Ag, 6230 Frankfurt Einbrenngummierung fuer offsetdruckplatten und verfahren zur herstellung einer offsetdruckform
JPS6231859A (ja) * 1985-08-01 1987-02-10 Fuji Photo Film Co Ltd 製版方法
GB8822956D0 (en) * 1988-09-30 1988-11-09 Cookson Graphics Plc Baking treatment of lithographic printing plate
US5278030A (en) * 1988-10-24 1994-01-11 Du Pont-Howson Limited Developer solution comprising ethyl hexyl sulphate, a surfactant, an alkaline material and having a pH of not less than 12
DE19518118C2 (de) * 1995-05-17 1998-06-18 Sun Chemical Corp Lichtempfindliche Zusammensetzung
DE19525050C2 (de) * 1995-07-10 1999-11-11 Kodak Polychrome Graphics Llc Sulfonamidsubstituierte Acetalpolymere und Verwendung derselben in lichtempfindlichen Zusammensetzungen und lithographischen Druckplatten
US5858940A (en) * 1996-04-30 1999-01-12 Orcutt; James L. Printing plate image deletion composition
DE19644515A1 (de) * 1996-10-25 1998-06-25 Sun Chemical Corp Amidosubstituierte Acetalpolymere und Verwendung derselben in photoempfindlichen Zusammensetzungen und lithographischen Druckplatten
DE19811330A1 (de) 1998-03-16 1999-09-23 Du Pont Deutschland Entwickler und Verfahren zur Herstellung von flexographischen Druckformen
US6461794B1 (en) * 1999-08-11 2002-10-08 Kodak Polychrome Graphics Llc Lithographic printing forms
DE10011096A1 (de) * 2000-03-09 2001-10-11 Clariant Gmbh Verwendung von carboxylgruppenhaltigen Acetalpolymeren in lichtempfindlichen Zusammensetzungen und lithographischen Druckplatten
US6270938B1 (en) 2000-06-09 2001-08-07 Kodak Polychrome Graphics Llc Acetal copolymers and use thereof in photosensitive compositions
DE10255667B4 (de) * 2002-11-28 2006-05-11 Kodak Polychrome Graphics Gmbh Strahlungsempfindliche Elemente mit ausgezeichneter Lagerbeständigkeit
DE10255663B4 (de) * 2002-11-28 2006-05-04 Kodak Polychrome Graphics Gmbh Strahlungsempfindliche Elemente

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046121A (en) * 1949-07-23 1962-07-24 Azoplate Corp Process for the manufacture of printing plates and light-sensitive material suttablefor use therein
BE631588A (enrdf_load_stackoverflow) * 1962-04-27
DE1208307B (de) * 1963-09-20 1966-01-05 Kalle Ag Verfahren und Material zur Herstellung von lithographischen Flach-Druckformen
AT293449B (de) 1965-11-24 1971-10-11 Kalle Ag Verfahren zum Herstellen einer Offsetdruckplatte aus vorsensibilisiertem Druckplattenmaterial
GB1513368A (en) 1974-07-08 1978-06-07 Vickers Ltd Processing of radiation-sensitive members
GB1507457A (en) * 1974-11-12 1978-04-12 Agfa Gevaert Fixer compositions used in planographic printing
JPS51143409A (en) * 1975-06-04 1976-12-09 Fuji Photo Film Co Ltd Method of making lithographic press plate
CH613059A5 (en) * 1975-06-30 1979-08-31 Hoechst Ag Method for producing a flat-bed printing forme
JPS53104301A (en) * 1977-02-22 1978-09-11 Ricoh Kk Treating solution for lithographic printing
JPS5470103A (en) * 1977-11-16 1979-06-05 Mitsubishi Paper Mills Ltd Liquid substance for treating surface of flat printing plate
US4191570A (en) * 1978-10-10 1980-03-04 Polychrome Corporation Process for heat treating lithographic printing plates
DE2855393A1 (de) 1978-12-21 1980-07-03 Hoechst Ag Verfahren zum herstellen von flachdruckformen

Also Published As

Publication number Publication date
DE3168463D1 (en) 1985-03-07
JPS5752057A (en) 1982-03-27
JPH0121500B2 (enrdf_load_stackoverflow) 1989-04-21
US4355096A (en) 1982-10-19
EP0043991A2 (de) 1982-01-20
EP0043991A3 (en) 1982-05-26
CA1164723A (en) 1984-04-03

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